I do know this LB, everyone loves a show and don't like being left out when they believe there is a "happening". With proper promotion and networking with other groups, an event will take on a life of it's own with regards to support and attendance. Our goal should be to push that "got to be there" snowball up the hill until it reaches the apex and starts rolling downhill on it's own.
I have been to FReeps in DC and NYC but I think the most effective FReeps are the ones that happen every week on the street cornors of America. You have to oppose these people every day and at every oppertunity. It has to be upfront and personal, one man, one sign makes a difference.